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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Loose Exhaust Push rod and Exhaust valve lifter
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<blockquote data-quote="davidd" data-source="post: 46986" data-attributes="member: 1177"><p>Eugene,</p><p></p><p>If you adjust it correctly and it loosens again on a short ride then it is probably the push rod collapsing. This happens if you have not matched the shape of the push rod end to the shape of the follower or the push rod adjuster. If the ball end of the push rod does not conform readily to the socket in the cam follower, it creates very high point loading and of course, the shape of the cams is hammering the push rods. </p><p></p><p>After a rebuild, I had a push rod that needed adjustment after every race or practice. After a few adjustments I replaced it hoping the spare would do better. It has been in the engine for several seasons now. The push rod I removed is below:</p><p><a href="http://s1017.photobucket.com/user/daviddunfey/media/Pushrodspb_1_zps99b4a50e.jpg.html" target="_blank"><img src="http://i1017.photobucket.com/albums/af300/daviddunfey/Pushrodspb_1_zps99b4a50e.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a></p><p>You can see that the end has collapsed compared to the stock pushrod. The best way to prevent this is by taking the high spots off the pushrod. You can do this with a stone by rocking the push rod in a dry cam follower and rocking it. When you pull it out you may see a small shiny spot on the ball end and you smooth it off on a grinding stone or diamond stone. Repeat until the entire ball is shiny and touching everywhere at the same time. Others chuck the push rod in a drill press and put fine grinding paste in the cam follower socket and run it at low speed until they match. In either case you may want to follow Bruce's advice and have a local member give you a hand with the project.</p><p></p><p>Finally, the bottom of the push rod may be digging a deeper hole in the cam follower. Less likely, but it happens.</p><p></p><p>David</p></blockquote><p></p>
[QUOTE="davidd, post: 46986, member: 1177"] Eugene, If you adjust it correctly and it loosens again on a short ride then it is probably the push rod collapsing. This happens if you have not matched the shape of the push rod end to the shape of the follower or the push rod adjuster. If the ball end of the push rod does not conform readily to the socket in the cam follower, it creates very high point loading and of course, the shape of the cams is hammering the push rods. After a rebuild, I had a push rod that needed adjustment after every race or practice. After a few adjustments I replaced it hoping the spare would do better. It has been in the engine for several seasons now. The push rod I removed is below: [URL=http://s1017.photobucket.com/user/daviddunfey/media/Pushrodspb_1_zps99b4a50e.jpg.html][IMG]http://i1017.photobucket.com/albums/af300/daviddunfey/Pushrodspb_1_zps99b4a50e.jpg[/IMG][/URL] You can see that the end has collapsed compared to the stock pushrod. The best way to prevent this is by taking the high spots off the pushrod. You can do this with a stone by rocking the push rod in a dry cam follower and rocking it. When you pull it out you may see a small shiny spot on the ball end and you smooth it off on a grinding stone or diamond stone. Repeat until the entire ball is shiny and touching everywhere at the same time. Others chuck the push rod in a drill press and put fine grinding paste in the cam follower socket and run it at low speed until they match. In either case you may want to follow Bruce's advice and have a local member give you a hand with the project. Finally, the bottom of the push rod may be digging a deeper hole in the cam follower. Less likely, but it happens. David [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Loose Exhaust Push rod and Exhaust valve lifter
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